[Mapserver-users] [gis newbie] Questions about EXTENT variable
Eduardo Patto Kanegae
eduardo at consultoria.eti.br
Tue Apr 20 08:17:49 PDT 2004
Did you check if your EXTENT for Boston is OK?
A nice tool to do it is using the "gdalinfo" that comes with GDAL package ( http://gdal.maptools.org )
$ gdalinfo a-tiff-file.tif
best
Eduardo Patto Kanegae
http://www.consultoria.eti.br
UIN: 303747254
I Encontro Nacional de Usuários MapServer - http://mapserver.cttmar.univali.br/encontro2004
Projeto MapServer Brasil - http://mapserver.cttmar.univali.br
***Fim da Mensagem / End of Message ***
On Tue, 20 Apr 2004 08:35:55 -0400, "P Wilkerson" <1wilkerson at charter.net> escreveu:
> De: "P Wilkerson" <1wilkerson at charter.net>
> Data: Tue, 20 Apr 2004 08:35:55 -0400
> Para: <mapserver-users at lists.gis.umn.edu>
> Assunto: [Mapserver-users] [gis newbie] Questions about EXTENT variable
>
> I have a simple PHP Mapscript that works when I use the EXTENT statement and
> tiff file that came with the gmap75 demo. However, when I attempt to use a
> different map (Boston) and change only the EXTENT statement and tiff file,
> Mapserver returns a blank page.
>
> Would somebody please explain what is going on and help out by providing a
> valid extent statement?
>
> Demo EXTENT -2200000 -712631 3072800 3840000
> Boston EXTENT 234503.759398496 899884.343580152 238052.631578947
> 902250.994765712
>
> Does Proj.4 Cartographic Projections Library have anything to do with this?
>
> Also, The TFW world files seemingly have different coordinate systems as
> well.
>
> Any help is warmly appreciated!
>
> Peter
>
> ----------------------------------
> DEMO MAP FILE
>
> MAP
> NAME Demomap
> SIZE 600 400
> IMAGECOLOR 255 245 220
> # FONTSET symbols/fonts/fonts.list
> # SHADESET symbols/shade.sym
> # MARKERSET symbols/marker.sym
> # LINESET symbols/line.sym
> EXTENT -2200000 -712631 3072800 3840000
> UNITS meters
> # SHAPEPATH "E:/ms4w/Apache/htdocs/map01/data/"
>
> WEB
> IMAGEPATH "/ms4w/tmp/ms_tmp/"
> IMAGEURL "/ms_tmp/"
> END
>
> LAYER
> # DESCRIPTION "Base Map: DemoMap"
> NAME "boston1868"
> STATUS DEFAULT
> TYPE RASTER
> DATA "E:/ms4w/Apache/htdocs/data/bath_mapserver.tif"
> END # Layer for base map
>
>
> END # Mapfile
> ----------------------------
>
> BOSTON MAP FILE
>
> MAP
> NAME boston1868
> SIZE 600 400
> IMAGECOLOR 155 145 220
> EXTENT 234503.759398496 899884.343580152 238052.631578947
> 902250.994765712
> EXTENT -2200000 -712631 3072800 3840000
> UNITS meters
>
> WEB
> IMAGEPATH "/ms4w/tmp/ms_tmp/"
> IMAGEURL "/ms_tmp/"
> END
>
> LAYER
> NAME "boston1868"
> STATUS ON
> TYPE Raster
> DATA "E:/ms4w/Apache/htdocs/data/boston1868.tif"
> END # Layer for base map
>
>
> END # Mapfile
>
>
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>
>
>
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